2161894 has 16 divisors (see below), whose sum is σ = 3725568. Its totient is φ = 921672.

The previous prime is 2161883. The next prime is 2161897. The reversal of 2161894 is 4981612.

It is a happy number.

2161894 is nontrivially palindromic in base 9.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4047 + ... + 4549.

It is an arithmetic number, because the mean of its divisors is an integer number (232848).

2^2161894 is an apocalyptic number.

2161894 is a deficient number, since it is larger than the sum of its proper divisors (1563674).

2161894 is a wasteful number, since it uses less digits than its factorization.

2161894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819.

The product of its digits is 3456, while the sum is 31.

The square root of 2161894 is about 1470.3380563666. The cubic root of 2161894 is about 129.3038527651.

It can be divided in two parts, 21618 and 94, that added together give a palindrome (21712).

The spelling of 2161894 in words is "two million, one hundred sixty-one thousand, eight hundred ninety-four".